364 LIVERPOOL MARINE BIOLOGY COMMITTEE REPORT. 



Fig. 7. Anterior end of Ciona intestinalis, showing pigment 



spots, enlarged. 

 Fig. 8. Imperfect internal longitudinal bars of Ascidia 



pleheia, x 50 diameters. 

 Fig. 9. Dorsal pigment spot, &c., of Ciona intestinalis, 



X 300 diameters. 

 Fig. 10. Ventral pigment spot, &c., of Ciona intestinalis, 



X 300 diameters. 



at, atrial aperture ; hr, branchial aperture ; c.d, connecting 

 duct ; d.p, dorsal pigment spot ; d,t, dorsal tubercle ; en, 

 endostyle ; h.jn, horizontal membrane ; i.l, internal longitu- 

 dinal bar ; l.v, fine longitudinal vessel ; n.g, nerve ganglion ; 

 n, nerves ; p.p\ large and small papillae ; p.p, peripharyngeal 

 band ; sg, stigmata ; tr, tr', tr", transverse vessels ; i\p, ven- 

 tral pigment spot. 



